Conservation Evidence strives to be as useful to conservationists as possible. Please take our survey to help the team improve our resource.

Providing evidence to improve practice

Individual study: Impact of pig slurry on soil properties, water salinization, nitrate leaching and crop yield in a four-year experiment in Central Spain

Published source details

Díez J.A., Hernaiz P., Muñoz M.J., de la Torre A. & Vallejo A. (2004) Impact of pig slurry on soil properties, water salinization, nitrate leaching and crop yield in a four-year experiment in Central Spain. Soil Use and Management, 20, 444-450


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Amend the soil with manures and agricultural composts Soil Fertility

A controlled, replicated experiment in 1998-2001 on sandy loam in Madrid, Spain (Díez et al. 2004) found the highest nitrate leaching from soil under excessive pig slurry (329 kg N/ha), followed by medium (215 kg N/ha) and low application (173 kg N/ha), compared to the control (78 kg/ha). Dissolved salts in the soil were higher under high (6,058 kg salts/ha) compared to medium application (2,019 kg salts/ha). Maize Zea mays grain yield was higher under high (11,961 kg/ha), medium (10, 984 kg/ha) and low application (10,797 kg/ha) compared to the control (9,363 kg/ha). Four slurry treatments were applied to a maize crop: control (no fertilizer), suboptimal/low (as urea), optimal/medium (170, 162 and 176 kg N/ha for 1998, 1999 and 2001), and excessive/high application (not specified). Slurry was applied to soil through a band spreader connected to a tanker and then incorporated into the soil by rotivation. There were three replicates of 9.9 x 11.1 m plots. Barley Hordeum vulgare was grown in 2000 to avoid excessive repeat-cropping with wheat, but results of that year were not reported in the study. Soils were sampled 33 times throughout the experiment using ceramic cups.